
BRIGHTNESS
and
CONTRAST
controls 3
Figure 3.1 CONTRAST control
determines the luminance
(proportional to intensity)
produced for white, with inter-
mediate values toward black
being scaled appropriately. In a
well-designed monitor, adjusting
CONTRAST maintains the correct
black setting- ideally, zero input
signal produces zero luminance
at any
CONTRAST
setting.
This chapter introduces the
BRIGHTNESS
and CONTRAST
controls of video. Beware: Their names are sources of
confusion! These operations are normally effected in
the nonlinear domain - that is, on gamma-corrected
signals. These operations are normally ...